Vocab Words Test Questions Flashcard

Atom
Smallest particle of an element
Element
A pure substance that contains only one kind of atom
Proton
The positive particle found in the nucleus of an atom
Neutron
A particle found in the nucleus of an atom that has no charge
Electron
The negatively charged particle only found in an atom
Nucleus
The small, dense, central core of an atom
Energy Levels
Orbits found outside the nucleus of an atom in which electrons travel
Atomic mass unit
The mass of a single proton or neutron; amu
Atomic number
The number of protons in the nucleus of an atom
Mass number
The total number of protons and neutrons in the nucleus of an atom; it is found by rounding off the atomic mass to the nearest whole number
Atomic mass
The sum of the relative masses of the protons and neutrons in an atom
Isotopes
Atoms of the same element that have a different number of neutrons
Ion
An atom or group of atoms that have an eletric charge  as the result of losing or gaining electrons
Periodic Table
The organization of elements by atomic number into a table: similar elements are grouped in horizontal rows (periods) and vertical columns (groups)
Period
A horizontal, row of elements in the periodic table; 7 rows = 7 periods 
Groups
Sets of elements arranged in vertical columns in the periodic table; 18 groups ; groups are often called families
Metal
Elements that tend to LOSE electrons easily; thay are located on the left of the staircase on the periodic table
Nonmetals
Elements that tend to GAIN electrons easily; they are located on the right of the staircase of the periodic table
Metalloids
Substances that exhibit some, but not all, of the properties of metals

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